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Underwater sound absorption performance of exponential gradient anechoic coating
Modern Physics Letters B, 2022In this paper, the gradient anechoic coating whose density changes exponentially along direction of thickness is investigated. A numerical model is established by finite element method (FEM) to analyze the underwater sound absorption performance under different density distribution.
Teng-Fei Si +3 more
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Some Experiments in Underwater Sound Absorption
The Journal of the Acoustical Society of America, 1961This paper discusses some experimental techniques for the measurement of sound absorbing materials in the 2- to 10-kc range. The experimental technique discussed is that of decay time measurements of a reverberant chamber. Several different kinds of signals have been used—namely pulsed sine waves, pulsed noise, and an impulse signal generated by the ...
R. A. Rubega, A. Culver
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Underwater sound absorption property of porous aluminum
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2001Abstract Porous aluminum was prepared by negative pressure infiltration process using removable granules. Underwater sound absorption coefficient α of the porous aluminum was determined by a pulse tube method. The relationship between α and pore structure of porous aluminum was studied.
Cheng Guiping, He Deping, Shu Guangji
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Porous-Solid Metaconverters for Broadband Underwater Sound Absorption and Insulation
Physical Review Applied, 2023202502 bcch ; Version of Record ; Others ; National Natural Science Foundation of China; Beijing Institute of Technology Research Fund Program for Young Scholars ; Published ; VoR ...
Hao-Wen Dong +7 more
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Hybrid honeycomb structure for enhanced broadband underwater sound absorption
International Journal of Mechanical SciencesFengxian Xin
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Tunable underwater sound absorption via piezoelectric materials with local resonators
International Journal of Mechanical SciencesXinyu Jia, Guoyong Jin, Tiangui Ye
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Underwater sound absorption characteristics of various species of wood
The Journal of the Acoustical Society of America, 1977In this experimental investigation, the acoustic absorption characteristics of various species of wood, rubber, and wood/rubber composites were determined under low hydrostatic pressure and over the frequency range 10–50 kHz. The test samples, including white pine, douglas fir, redwood, fir plywood, Saper-Trubber, and bubble rubber were typically 4 ft ...
G. C. Lauchle, F. A. Barge
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Results in EngineeringThis study proposes an underwater coating with sound absorption ability in the middle-to-low frequency range and establishes an acoustic theoretical model combining the equivalent medium theory and the transfer matrix method.
Nan-Sha Gao, Mou Wang
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Absorption of Underwater Sound by Substances in Process of Solution
Nature, 1955IN the course of work on the transmission of acoustic waves through aqueous solutions, we have noticed that solid substances in process of solution become extremely efficient absorbers of acoustic energy. In a typical experiment in which transmission was taking place at 400 kc./s. between transducers 1 ft. apart, the addition of 1 per cent by weight of
R. D. C. REED, T. S. McLEOD
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Investigation of the underwater sound absorption and damping properties of polyurethane elastomer
Journal of Thermal Analysis and Calorimetry, 2021In this work, the acoustic absorption performance of polyurethane (PU) elastomer consisted of different molecular masses of polypropylene glycol (PPG), and a PU composite sample was made by adding multi-wall carbon nanotubes (MWCNT) was studied. Using the acoustic pulse tube device and spectrum of dynamic mechanical thermal analysis, modulus, glass ...
Mohammad Javad Sharifi +2 more
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